Dental post construction

ABSTRACT

A dental post is provided comprising a top section and a stem with a slot which extends lengthwise through the stem to form a plurality of legs. The legs have wings attached thereto which fit into indentations in a wall of a tooth bore. Kits are provided comprising the dental post and burs for forming a tooth bore to accommodate the dental post and optionally a core for supporting a tooth crown, a template for forming holes in a tooth stub and a key for providing support for the core.

REFERENCE TO RELATED APPLICATIONS

This application is a continuation in part of Ser. No. 07/908,366, filedJul. 6, 1992, pending, which, in turn, continuation in part of Ser. No.07/896,388, filed Jun. 10, 1992, pending, which, in turn, is acontinuation in part of application Ser. No. 07/739,670 filed Aug. 3,1991, now U.S. Pat. No. 5,277,583.

BACKGROUND OF THE INVENTION

This invention relates to a dental post construction which can beinserted into a tooth stub and which is utilized to improve retention ofa dental restoration built onto the tooth stub.

It is present dental procedure to form a dental prosthetic structureonto a tooth stub for replacement of missing dentition. In thisprocedure, a tooth stub is initially prepared by removing the diseasedor damaged top portion of a tooth to form a tooth stub. A base is formedby drilling into the root canal portion of the tooth stub to form aspace into which a dental post can be inserted. Presently availabledental post include grooves on their surface designed to improveretention of the post within the tooth stub. Dental cement is employedin the bore in conjunction with the dental post to secure the post inthe tooth stub. A portion of the post extends above the tooth stub uppersurface so that a dental prosthesis formed on the tooth stub can beretained. Presently, the implantation of a dental post relies eitherupon the adherent strength of an adhesive or on lateral stress forcesbetween the dental post and the canal wall of screw type posts.

Preformed posts are posts which are premade to specific dimensions withmatching burs having cutting surfaces. The burs have a matching diameterto the past and prepare the root to accept a post. A post is then triedin the root and cut to the appropriate length. Cement is spun into thecanal with a device referred to as a lenticulo spiral, placed directlywith a syringe and/or placed directly on the post. The post is placed inthe canal and held in position until excess cement extrudes and thecement hardens. Most preformed posts require placing filling materialaround the top of the post to transfer strength from the post to thecrown. This procedure is referred to as the core build up or post andcore procedure.

There are many problems which are encountered when utilizing preformedposts. These include:

An inaccurate fit develops with present bur technology.

Potential for perforation of the root is great with present burs.

There is inadequate resistance to rotational forces on the post.

Root fracture caused by lateral stresses occurs.

There is weak transfer of strength from the post to the crown positionedon the post.

An accurately drilled hole results in good proximity of the post to thecanal walls with a thin cement layer to provide greater success inproperly positioning the post. The hole is inaccurate if tipping orvibrating of the bur occurs during root preparation as occurs withpresent drilling systems. This adds to the failure rate of preformedpost systems. Drilling a straight hole for a straight post in a curvedcanal or drilling a hole which does not align with a canal can lead toperforation of a root and loss of a tooth. All posts must resist normalrotational forces which occur during normal or abnormal functions ifthere is not sufficient tooth structure to provide resistance. Ingeneral, preformed posts do not provide good stability againstrotational force because they are round and rotate easily when placed ina round hole such as that provided by present bur systems. Presently, tocompensate for this, a separate pin may be placed into the tooth,however, screw pins increase the likelihood of root fracture. Somesystems try to make posts oval or non-symmetrical at the top but do notsupply dependable resistance and retention form. Cement merely providessuction to hold a post in position. The strength of the cement becomes aweak point to the root-post-crown relationship. Constant repeated forcesof chewing causes potential breakdown on the tooth-cement-crowninterface with subsequent cement wash out and crown post failure. Anuneven or excessive amount force can cause root fracture and tooth loss.Screw type posts can exert large lateral stresses which leads topotential root fracture and tooth loss. In addition, forceful placementof cement type posts without proper venting of cement can cause rootfracture and tooth loss. Filling material is placed around a preformedpost above the root to accept a crown after the post is cemented. Thestrength and long term stability of this material becomes a weak link inlong term success of the crown. In addition, proper design of the postabove the root is critical to resist rotation or dislodging of thefilling material from the post.

A cast post is inducted for root canalled teeth with no clinical crown(no tooth above the height of the gums) and/or teeth with root canalspaces which are shaped in such a manner that a preformed post can notfit properly. For example, a canal may be narrow at its bottom half anddiverge rapidly in the top half or it may be too oval shaped. Thepreformed post which is of the same diameter throughout can notaccommodate these situations. When utilizing a cast post, rootpreparation is done by drilling to remove undercuts and obtain slightdivergence from the bottom upward. The cast post technique takes animpression of a prepared root canal space. In indirect methods, animpression of the root is taken with a dental impression material. Indirect methods, an acrylic pattern of the prepared root and the desiredshape above the gums is achieved in the mouth. Laboratory procedureswhich include casting in a lost wax technique are then necessary toconstruct the cast post. There are many problems which are encounteredwhen utilizing casts posts. The problems include: An increased chance ofroot fracture. The cast post is expensive. There is an increasedpossibility of root perforation. The cast post may not provide goodresistance to rotational forces.

All posts need to provide venting of cement as a post is placed. A castpost is very precise fitting so it is difficult for cement to vent,lateral forces can fracture the root and/or the post will not be fullyseated as excess cement remains in the bottom. In addition, any bubblesor inaccuracies from the casting process can cause a poor fit and rootfracture. Cast posts dramatically increases cost as compared topreformed posts because there are laboratory fees and increased timerequired to treat the patient. For a cast post, an appointment is neededfor an impression in addition to an appointment for post placement. Thepatient cost of a cast post is double the cost of a preformed post. Thedoctor's laboratory cost may be five to ten times the cost to buy apreformed post.

Preparation of a root canal space must be free of any undercuts orremoval of a cast post in its plastic or wax phase of construction willbe impossible. It is often difficult to attain this as root canals tendto be complex systems of lateral canals, ribbon shapes, multiple canals,etc. Often, excessive drilling is done which removes important toothstructure and leads to a weaker root and increased chance of rootfracture or perforation.

It has been proposed in U.S. Pat. Nos. 4,480,997; 4,490,116 and Re31,948 to utilize a threaded dental post which is introduced into thebore of a tooth stub by being rotated to thread the post into position.The dental post includes a stem portion having a slot extending throughthe stem thickness and along its length which renders the stem beingformed of two legs each having its outside surface threaded. The outsidesurface of the legs intimately contact the walls of the bore so that thethreads on the legs can engage the walls. In addition, a spring-likeconnection for the two legs is provided so that a radial outward springforce is applied to the legs to force them against the bore walls. Thesedental posts are undesirable since a rotational force must be applied tothe post to position it properly into the bore. This positioning processis undesirable since it is time consuming and causes the patientdiscomfort. In addition, the possibility exists that the post will bethreaded too far into the tooth stub which will result in fracture ofthe tooth stub. Furthermore, the radially outward forces of the legs onthe tooth stub can result in fracture of the tooth stub over time.

U.S. Pat. No. 1,534,409 discloses a two legged post having corrugatedsurfaces which fit into a root canal having generally parallel walls.This surface design materially reduces the post surface area whichcontacts the canal walls and thus post retention relies primarily uponcement adhesive strength.

U.S. Pat. No. 791,641 discloses a crown construction adapted to be fitin the surface of a tooth stump. A pin is provided having a lower onesided end adapted to fit into a root canal and a split upper portionhaving legs which are forced apart from each other by means of a wedge.In the absence of the wedge, the legs contact each other by springforces which must be overcome by the force exerted by the wedge. Thelegs have lugs which fit into recesses of the crown after the wedge isinserted. No lugs are provided on the portion of the pin which isinserted into the root canal. This structure is understandable due tothe force required to position it into a root canal. These requiredforces undesirably enhance the possibility of fracturing the toothstructure after the pin is positioned.

Accordingly, it would be desirable to provide a dental post which can beinserted into the bore of a tooth stub while eliminating the need forsole reliance upon lateral stress forces with the canal wall or upon theadhesive strength of an adhesive. In addition, it would be desirable toprovide a dental post which interacts with indentations in the walls ofthe bore by mechanical interaction in order to retain the post in thebore by mechanical interaction in order to retain the post in the borewhile minimizing or eliminating forces on the walls exerted by the post.In addition, it would be desirable to provide a system for forming amating hole in a tooth stub for such a dental post and for properlypositioning the post manually within the bore. Furthermore, it would bedesirable to provide a system for utilizing such a dental post whichfacilitates the placement of a core and a crown.

SUMMARY OF THE INVENTION

This invention provides a dental post having a stem section formed of aplurality of spaced-apart legs, usually two or four legs, which arejoined to a top section. The top section is of a length so as to extendbeyond an upper surface of the tooth stub thereby allowing retention ofa prosthesis. The legs are spaced apart so as to allow manualcompression. At least two legs are provided with at least one wingsection extending radially outward from the surface of the leg. Sets ofwings are provided, on different legs which are positioned at the samevertical height from the bottom section of the post. A dental adhesiveis placed in the bore prior to placing the post within the bore. Thepost is grasped either manually or mechanically to compress the legstogether so that the wings are positioned radially inwardly from thewails of the bore. In this position, the post can be moved within thebore, vertically, horizontally or rotationally until the wings arepositioned into mating slots previously formed within the walls of thebore. The compression force on the legs is released when the wings haveentered the bore. Upon the wings entering the mating slots, lateralforce of the legs is released. The noncompressed legs exert little or noexpansion force on the bores wails being properly positioned. Suitabledrill burs are provided to shape and position the slots in the borewalls to mate properly with the wings on the legs of the dental post.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a dental post of this invention.

FIGS. 2, 3 and 4 show alternative cross sections of the legs of the postof FIG. 1 taken along line A--A.

FIGS. 6, 7 and 8 are side views to illustrate a set of drill burs whichcan be utilized in conjunction with the dental post of this invention.

FIG. 9 is a side view of a drill bur which can be utilized to replacethe drill bur of FIG. 8.

FIG. 10 is a side view of a template which can be utilized inconjunction with this invention.

FIG. 11 is a top view of the template of FIG. 10.

FIG. 12 is a cross section view of a core which can be utilized inconjunction with the dental post of this invention.

FIG. 13 is a top view of the core of FIG. 12.

FIG. 14 is a cross sectional view of an alternative core which can beutilized in conjunction with the dental post of this invention.

FIG. 15 is an isometric view of a key device which can be utilized inconjunction with the dental post of this invention.

FIGS. 16a-h are cross sectional views illustrating the installation ofthe dental post of this invention.

FIG. 17 is a side view of a drill bur which can be utilized to replacethe drill bur of FIG. 8.

FIG. 18 is a side view of a handle useful with the post of thisinvention.

FIG. 19 is a side view of an alternative handle useful with the post ofthis invention.

FIG. 20 is a top view of an alternative template useful in the system ofthis invention.

FIG. 21 is a side view of a bur useful with the template of FIG. 20.

FIG. 22 shows a tapered post of this invention.

FIG. 23 is an isometric view of an alternative post of this invention.

FIG. 24 is an isometric view of an alternative post of this invention.

FIG. 25 is an isometric view of the post of FIG. 24.

FIG. 26 is an isometric view of an alternative post of this invention.

DESCRIPTION OF SPECIFIC EMBODIMENTS

The dental post of this invention includes a means for locking it intothe walls of a tooth bore without the requirement of maintaining thepost under pressure, self induced or otherwise, against the bore walls.The dental post includes a stem having a slot which forms a plurality oflegs. At least one leg includes a wing extending radially outward fromthe leg. The wing is shaped to mate with an indentation of the toothbore wall which is formed with a drill bur. Each leg can include one ora plurality of wings, each of which mates with separate indentations inthe wall. The legs are sufficiently flexible so that they can becompressed manually or mechanically for ease of insertion into andremoval from the tooth bore. The surface of the legs can be roughened byany conventional technique such as by sand blasting, acid etching,molding or the like. The roughened surface provides an increased surfacearea which results in improved retention of the post within the canal.When the legs are compressed, so that the wings can fit within theopening of the tooth bore, the post is inserted into the bore. Once thewings have entered the bore of the tooth stub, compression force isreleased and the post is pressed in a downward direction until the wingsengage matching slots resulting in the legs resuming a positionessentially parallel to each other. The wings can be at the same ordifferent heights. The wings can be the same or different sizes. It isadvantageous to have wings with matching indentations which are greatersize in height (from top of the wing to the bottom) at lower levels toallow an accurate fit in only one position. The legs are not prestressedso as to avoid exertion of a force by the legs on the bore walls. Byeliminating this stress in the legs, the tooth stub is not subjected toa continuing expansion force from within the tooth stub. Therefore, thetooth stub is less likely to fracture during normal use as compared to atooth stub containing a dental post that exerts a continuing expansionforce. The indentations are formed by a set of drill burs which fit onconventional dental drills. The surface of the burs are designed toprepare the tooth bore for insertion of the dental post and to form thewall indentation which mate with the wing portions of the dental post.

In cases where the success of the root canal is questionable, the postcan be implanted without employing a dental cement in the root canal.The wings mechanically lock into the wall indentations upon placementbut disengage if the post is rotated ninety degrees. The elimination ofcement within the canal is advantageous since, with present technology,when a root canal fails and a post is present, the post cannot beremoved for retreatment of the root canal. This necessitates thatsurgery be done to the root to eliminate infection. When the post isremovable, as in the case when cement within the canal is not utilized,surgery can be avoided and the root canal can be retreated to eliminateinfection.

In one aspect of this invention, a system, including a template, bursand a core for a tooth crown, is provided for use in conjunction withthe dental post of this invention. A template apparatus is inserted intothe tooth bore. The template includes holes positioned and shaped toaccommodate burs used to form holes on the tooth stub top surface in ashape and design to accommodate a core for a tooth crown or separatepins. In addition, the template is shaped to accommodate burs used toform holes on the tooth stub which mate with wings on the dental post toprevent the post from rotating after implantation. The dental post ofthis invention also can be provided with wings extending radially fromthe leg surfaces which wings mate with indentations on the core surfaceadjacent to the dental post.

In an alternative version, the dental post has a central hole from thetop of the post through to the bottom. A key is passed down the holefrom the top and between the legs of the lower section to preventdisengagement of the wings into the root.

Referring to FIGS. 1 through 4, the dental post 10 formed from anysuitable dental material includes a top section 12 and a stem section14. The top section can have a round, oval, square, rectangular or thelike cross sections. The top section is straight or angled in relationto the long axis of the post. The area where the post exits the toothstub is solid which provides maximum strength. The stem section 14comprises a plurality of legs 16 formed by virtue of a slot 18 whichextends through the thickness of the stem section 14. The use ofadditional slots results in forming additional legs. For convenience,the dental post 10 is shown with two legs. However, it is to beunderstood that up to eight legs can be formed conveniently withappropriate slots in stem section 14. The wings 20 are secured to orformed integrally with the legs 16 such as by conventional molding,machining or casting processes. The wings 20 are preferably positionedat diametrically opposed positions with respect to each other.

The dental post can be made of a variety of sizes. For example, a dentalpost can extend about 3 to 18 mm into the root and 1 to 7 mm above theroot. A typical dental post diameter can vary between about 0.2 and 2mm. The wings can extend a length away from the legs a distance betweenabout 0.1 and 2 mm. It is to be understood that these dimensions areexemplary and will vary with the need of the patient. The sides may beparallel or tapered. The top section 12 can be straight or angled toaccommodate angled coronal tooth structure.

As shown in FIGS. 2 and 4, the legs can have a semi-circularcross-section. As shown in FIG. 3, The wings 17 can have a C-shapedcross-section. The wings 20 can have sharp edges as shown in FIGS. 2 and3 or the wings 22 can have a curved edge as shown in FIG. 4. The legs 16are sufficiently flexible so that they can be compressed manually andthe bottom edges 24 can be contacted with each other. During thiscompression step, the wings 20 are moved radially inward toward slot 18.As shown in FIG. 5, a plurality of sets of wings 20, 24 and 26 can besecured to or formed integrally with legs 16.

A set of drill burs which can be utilized in conjunction with the dentalpost of this invention are shown in FIGS. 6, 7 and 8. Conventionalreamers such as gates gliddens and peeso reamers are utilized to formthe general gross shape of the tooth bore. The bur 28 includes a shaft30 to facilitate attachment to a conventional dental drill apparatus anda shaft 32 having smooth ends 34 and 36 and a rough central portion 38.The central portion 38 cuts the tooth to form the bore. The smooth ends34 and 36 do not cut the tooth so as to minimize or prevent undesirablelateral movement of the bur 28 into the tooth. As shown in FIG. 7, bur40 includes a shaft 4 having a rough end 42, a smooth central portion 44and a roughened disk 46. The bur 40 is provided with a shaft 43 forattachment to a conventional dental drill. The end 42 functions toprovide a final general shape to the tooth bore while disk 46 provides asmooth surface to the top surface of the tooth stub being treated. Thebur 48 of FIG. 8 provides the means for forming the indentations in thewalls of the tooth bore into which fit the wings 20 or 22, 24 and/or 26.If it is desired to eliminate indentations for ,sings 24 and 26, disks49 and 50 having roughened surfaces is of the same general shapes wings20 and 22. In addition, the top surface of the disc can be smooth toprevent accidental upward movement during use. Also, Bur 48 can beoscillated as represented by arrow 52 to form discrete indentation inthe tooth bore wall or can be rotated in contact with the entire borewall as represented by arrow 53 to form a continuous indentation aboutthe circumference of the bore. It is preferred to form discreteindentations in order to minimize rotation of the post 10 afterplacement in the tooth bore. An alternative bur to the bur representedin FIG. 8 is shown in FIG. 9. The bur 54 includes a shaft 53 forattachment to a dental drill, a smooth disk 56 and a disk 57 having aroughened surface. As the disk is moved across the top surface of atooth stub, the surface 57 positioned within a stub forms anindentation.

Referring to FIGS. 10 and 11, a template arrangement 59 is providedcomprising a stem formed of a plurality of flexible legs 62 and a slot60. Legs 62 have small wings 21 that fit into indentations 73 of tooth71. The legs 62 fit within a tooth bore (see FIG. 16e) so that template63 rests on the top surface of a tooth stub. A handle 64 is provided sothat the template arrangement 59 can be manually inserted into a toothbore. The template 63 is provided with holes 65 and 66 into which areinserted burs of appropriate size in order to from holes through the topsurface of a tooth stub. These holes 65 are provided with parallelsurfaces 45 so that straight parallel surfaces can be formed in theholes of the tooth corresponding to template holes 65. These parallelsurfaces mate with wings on the dental post to prevent rotation of thepost after implantation which will be explained in more detail below.Thereafter one of the cores 67 or 69 of FIGS. 12, 13 or 14 is positionedon the tooth stub by inserting the pins 70 into the holes formed on thetop surface of the tooth stub.

Core 67 is provided with slots 85 which mate with wings of a dental post(see FIG. 22) and is provided with internal slots 88 which mate withextension 90 of leg 91 (see FIG. 15). Alternatively, the bore 87 of core67 can be threaded to mate with threads on the top portion 89. Thisallows the core to be removed by unscrewing it from the portion 12. Core69 is provided with internal slots 89 which mate with extension 90. Byproviding the pins 70 and the internal slots 88 or 89 for the key, thecore is secured for maximum retention and maximum resistance torotation. The core preferably is made of a material which promotes easeof recontour by a dental bur such as a soft composite material. Forexample, the core can be formed of a metal mesh filled interstitiallywith a composite material.

Referring to FIGS. 16 a-h, the use of the system of this invention isillustrated. As shown in FIG. 16a, an initial tooth bore 72 is formedwith a conventional reamer and filled with a conventional fillingmaterial such as a gutta percha based material. In a second step asshown in FIG. 16b, the bur 28 of FIG. 6 is used to shape the bore. Thefinal bore shape is formed with bur 40 of FIG. 7 as shown in FIG. 16c.The bottom surface 93 of the bur 40 is flat thereby forming a flatsurface on the remaining filling material 94 in the bottom of the bore.The indentations 73, 74 and 75 in the wall 76 of bore 79 are formed withbur 48 of FIG. 8 as shown in FIG. 16d. The bottom surface 96 of bur 48contacts the flat surface 97, thereby effecting the proper verticalpositioning of burs 49, 50 and 51. The template arrangement 59 of FIGS.10 and 11 then is inserted into bore 72 and bur 78 is used to form holes79 through the top surface 80 of tooth stub in FIGS. 16e and f. Thetemplate can include wings 22 having a rounded surface. An adhesive isplaced within the bore 72 to position the post 10 into the bore 72.Excess adhesive passes upwardly within the bore 72 through slot 18 andexits the tooth stub so the proper amount of adhesive remains within thetooth stub. As shown in FIGS. 16g and h, the post 10 of this inventionis inserted into bore 72 followed by positioning of the core 68 on thetooth surface.

Referring to FIG. 17, the drill bur 80 includes a toughened section 82and smooth sections 83 and 84 to form the wall indentations of aspecific shape such as round, triangular or square or the like.

Referring to FIG. 18, a handle 98 having a hollow bore which mates withthe top portion 99 of post 10 is provided as a convenient means forinserting the post 10 into the tooth stub and for rotating the post 10within the tooth stub to position the wings properly therein. After thepost has been placed, the handle can be removed by pulling it from thepost 10.

Handle 101 of FIG. 19 is formed integrally with one leg at post 10 andhas a breakaway point 102 at which the handle can be broken from thepost 10 after placement in the tooth bore.

Referring to FIGS. 20 and 21, the template 63 of FIG. 11 can be providedwith guide rails 104 which extend above surface 105 and define surfaces106. Bur 108 having cutting cylinder 110 then can be fit into holes 65so that bottom surface 112 of bur 108 contacts surfaces 106 and sidesurface 114 of bur 108 contacts guide rails 104 during use therebyforming holes having parallel surfaces 45.

Referring to FIG. 22, the post 31 includes a plurality of wings 33, atapered exterior surface 35 and wings on upward legs 31 with wings 37.

Referring to FIG. 23, the post 92 has downward slot 18a forming legs 16awith a plurality of wings 19. An attached template disk 68 has holes 61which guide placement for pins 77 which pass through holes 61 oftemplate disk 17 into the tooth stub. Pins 77 are parallel or angled toeach other or to the long axis of post 10.

Referring to FIG. 24 and 25, the post 122 has downward slot 130 anddownward legs 124 with wings 126. Post 122 has central hole 128 whichpasses from the top to the bottom of post 122. Key 132 passes intocentral hole 128 and screws downward until it fills slot 130. Key 132 isthreaded but can be tapered or straight and threaded or non threaded.

Referring to FIG. 26, post 136 has top section 140 which is angled inrelation to the long axis of the stem section 142.

I claim:
 1. A dental post for insertion into a bore of a tooth whichcomprises:a top section, a stem attached to said top section having atleast one slot extending lengthwise through said stem to form aplurality of spaced apart legs, said legs being substantially parallelto each other and being free of prestress force, at least one of saidlegs having a wing section extending radially from an outside surface ofsaid legs a distance to fit within an indentation in a wall of said borein the absence of a force on said legs, each of said legs having alength such that said top section extends beyond a top surface of atooth when inserted in said tooth, and said legs being movable relativeto each other when subjected to a compression force at said free endssuch that said wings are removed from an indentation in said wall. 2.The dental post of claim 1 wherein at least one of said legs has aplurality of said wings.
 3. The dental post of claim 1 wherein at leastone wing on each leg is at essentially the same vertical position as awing on a second leg.
 4. The dental post of claim 1 wherein a surface ofsaid legs is roughened.
 5. A dental post for insertion into a bore of atooth which comprises:a top section, said top section having at leastone slot extending lengthwise through said top section to form aplurality of spaced apart legs, said legs being substantially parallelto each other being free of prestressed force, a stem attached to saidtop section having at least one slot extending lengthwise through saidstem to form a plurality of spaced apart legs, said legs beingsubstantially parallel to each other and being free of prestress force,at least one of said legs having a wing section extending radially froman outside surface of said legs a distance to fit within an indentationin a wall of said bore in said absence of a force on said legs, each ofsaid legs having a length such that said top section extends beyond atop surface of a tooth when inserted in said tooth, and said legs beingmovable relative to each other when subjected to a compression force atsaid free ends such that said wings are removed from an indentation insaid wall.
 6. The dental post of claim 5 wherein at least one of saidlegs on said stem section has a plurality of said wings.
 7. The dentalpost of claim 5 wherein at least one wing on each leg of said stemsection is at essentially the same vertical position as a wing on asecond leg.
 8. The dental post of claim 5 wherein a surface of said legsis roughened.
 9. The dental post of claim 5 wherein said legs of saidtop section of said post includes wings extending from said legs at aposition above a top surface of said tooth.
 10. The dental post of anyone of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 having two legs.
 11. Thedental post of any one of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 and furtherincluding a kit comprising:a.) a first bur having a cylindrical shafthaving a firsts end smooth non-cutting surface, a second end smoothnon-cutting surface and an intermediate surface between said first endsurface and said second end surface, said intermediate surfacecomprising a cutting surface. b.) a second bur having cylindrical shafthaving a first end smooth surface, a first end having a diameter greaterthan said intermediate smooth surface and having greater than saidintermediate smooth surface and having a surface comprising a cuttingsurface which forms a flat surface on the top of the root stub and asecond end comprising a cutting surface to form a flat surface on thebottom surface within a bore of a tooth and c.) a third bur comprising acylindrical smooth main shaft and at least one cylindrical cuttingsurface secured to said main shaft and having a diameter sufficientlygreater than said main shaft so as to form indentations into the wall ofsaid bore wherein a wing and said post fit when said post is insertedinto said bore.
 12. The dental post of any one of claims 1, 5, 2, 6, 3,7, 4, 8 or 9 and further including a kit further comprising:a.) a firstbur having a cylindrical shaft having a first end smooth non-cuttingsurface, a second end smooth non-cutting surface and an intermediatesurface between said first end surface and said second end surface, saidintermediate surface comprising a cutting surface. b.) a second burhaving cylindrical shaft having a first end smooth surface, a first endhaving a diameter greater than said intermediate smooth surface andhaving greater than said intermediate smooth surface and having asurface comprising a cutting surface which forms a flat surface on thetop of the root stub and a second end comprising a cutting surface toform a flat surface on the bottom surface within a bore of a tooth andc.) a third bur comprising a cylindrical smooth main shaft and at leastone cylindrical cutting surface secured to said main shaft and having adiameter sufficiently greater than said main shaft so as to formindentations into the wall of said bore wherein a wing and said post fitwhen said post is inserted into said bore. and d.) a template comprisinga stem and plate attached to said stem having a size which permitsinsertion of said stem within a bore of a tooth, said plate having afirst set of holes and a second set of holes, said first set of holespermitting communication of a bur with said bore and a top surface ofsaid tooth and said second set of holes permitting communication of abur with said to surface of said tooth while preventing communicationwith said bore.
 13. The kit of claim 12 wherein said plate of saidtemplate includes guide means for a bur to from a hole having parallelsurfaces in communication with said bore.
 14. The dental post of any oneof claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 and further including a kitfurther comprising:a.) a first bur having a cylindrical shaft having afirst end smooth non-cutting surface, a second end smooth non-cuttingsurface and an intermediate surface between said first end surface andsaid second end surface, said intermediate surface comprising a cuttingsurface. b.) a second bur having cylindrical shaft having a first endsmooth surface, a first end having a diameter greater than saidintermediate smooth surface and having greater than said intermediatesmooth surface and having a surface comprising a cutting surface whichforms a flat surface on the top of the root stub and a second endcomprising a cutting surface to form a flat surface on the bottomsurface within a bore of a tooth and c.) a third bur comprising acylindrical smooth main shaft and at least one cylindrical cuttingsurface secured to said main shaft and having a diameter sufficientlygreater than said main shaft so as to form indentations into the wall ofsaid bore wherein a wing and said post fit when said post is insertedinto said bore. and d.) a template comprising a stem and plate attachedto said stem having a size which permits insertion of said stem within abore of a tooth, said plate having a first set of holes and a second setof holes, said first set of holes permitting communication of a bur withsaid bore and a top surface of said tooth and said second set of holespermitting communication of a bur with said to surface of said toothwhile preventing communication with said bore. and f.) a core of a sizeto be positioned on a top surface of a tooth, said core having a secondbore of a size to permit a portion of said post extending above saidtooth to be positioned within said second bore, said core having atleast one leg of a size to be positioned with holes formed by a bur insaid second set of holes in said template.
 15. The kit of claim 14wherein said plate of said template includes guide means for a bur tofrom a hole having parallel surfaces in communication with said bore.16. The dental post of any one of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 andfurther including a kit further comprising:a.) a first bur having acylindrical shaft having a first end smooth non-cutting surface, asecond end smooth non-cutting surface and an intermediate surfacebetween said first end surface and said second end surface, saidintermediate surface comprising a cutting surface. b.) a second burhaving cylindrical shaft having a first end smooth surface, a first endhaving a diameter greater than said intermediate smooth surface andhaving greater than said intermediate smooth surface and having asurface comprising a cutting surface which forms a fiat surface on thetop of the root stub and a second end comprising a cutting surface toform a flat surface on the bottom surface within a bore of a tooth andc.) a third bur comprising a cylindrical smooth main shaft and at leastone cylindrical cutting surface secured to said main shaft and having adiameter sufficiently greater than said main shaft so as to formindentations into the wall of said bore wherein a wing and said post fitwhen said post is inserted into said bore. and d.) a template comprisinga stem and plate attached to said stem having a size which permitsinsertion of said stem within a bore of a tooth, said plate having afirst set of holes and a second set of holes, said first set of holespermitting communication of a bur with said bore and a top surface ofsaid tooth and said second set of holes permitting communication of abur with said to surface of said tooth while preventing communicationwith said bore. and e.) a core of a size to be positioned on a topsurface of a tooth, said core having a second bore of a size to permit aportion of said post extending above said tooth to be positioned withinsaid second bore, said core having at least one leg of a size to bepositioned with holes formed by a bur in said second set of holes insaid template. and f.) a key structure of a size and shape to fit withsaid slot of said post in a portion of said post extending above saidtooth.
 17. The kit of claim 16 wherein said plate of said templateincludes guide means for a bur to from a hole having parallel surfacesin communication with said bore.
 18. The kit of claim 16 wherein saidcore includes second slots within said second bore and a portion of saidkey fits within said slots.
 19. The dental post of any one of claims 1,5, 2, 6, 3, 7, 4, 8 or 9 further comprising a template attached to saidtop section between said free end and said wings of said stem section.20. The dental post of any one of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9further comprising two legs and a template attached to said top sectionbetween said free end and said wings of said stem section.
 21. Thedental post of any one of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 furthercomprising a template attached to said top section between said free endand said wings of said stem section, said template having at least onehole there through and a pin extending through each of said holes. 22.The dental post of any one of claims 1, 5, 2, 6, 3, 7, 4, 8 or 9 furthercomprising a template attached to said top section between said free endand said wings of said stem section, said template having at least onehole there through and a pin extending through each of said holes,andhaving two legs.
 23. The dental post of any one of claims 1, 5, 2, 6, 3,7, 4, 8 or 9 further comprising a key extending through said top sectionand into a space between said legs.